Package org.geotools.coverage.processing

Class BaseScaleOperationJAI

Object

AbstractOperation

Operation2D

OperationJAI

BaseScaleOperationJAI

All Implemented Interfaces:

Serializable, Operation

Direct Known Subclasses:

Affine, FilteredSubsample, Scale, SubsampleAverage, Warp

public abstract class BaseScaleOperationJAI
extends OperationJAI

Base class for providing capabilities to scale GridCoverage2D objects using JAI scale operations.

This class tries to handles all the problems related to scaling index-color images in order to avoid strange results in the smoothest possible way by performing color expansions under the hood as needed. It may also apply some optimizations in case we were dealing with non-geo view of coverage.

Since:

2.5

Author:

Simone Giannecchini, GeoSolutions.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class OperationJAI

OperationJAI.Parameters

Field Summary

Fields

Modifier and Type	Field	Description
static final String	AFFINE
static final String	ROI
static final String	SCALE
static final String	TRANSLATE
static final String	WARP

Fields inherited from class OperationJAI

operation, RENDERED_MODE

Fields inherited from class Operation2D

PRIMARY_SOURCE_INDEX, SOURCE_0

Fields inherited from class AbstractOperation

descriptor

Constructor Summary

Constructors

Constructor	Description
BaseScaleOperationJAI(String operation)	Constructor for BaseScaleOperationJAI.
BaseScaleOperationJAI(OperationDescriptor operation)	Constructor for BaseScaleOperationJAI.
BaseScaleOperationJAI(OperationDescriptor operation, ParameterDescriptorGroup descriptor)	Constructor for BaseScaleOperationJAI.

Method Summary

Modifier and Type	Method	Description
protected GridCoverage2D	deriveGridCoverage(GridCoverage2D[] sources, OperationJAI.Parameters parameters)	Applies a JAI operation to a grid coverage.

Methods inherited from class OperationJAI

createRenderedImage, deriveCategory, deriveName, deriveRange, deriveSampleDimension, deriveUnit, doOperation, equals, extractSources, getJAI, getOperationDescriptor, getProperties, getQuantitative, handleJAIEXTParams, handleROINoDataInternal, handleROINoDataProperties, hashCode, prepareParameters, resampleToCommonGeometry

Methods inherited from class Operation2D

extractSources, getFactory

Methods inherited from class AbstractOperation

getDescription, getDocURL, getName, getNumSources, getParameters, getVendor, getVersion, toString

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

AFFINE

public static final String AFFINE

See Also:

• Constant Field Values

SCALE

public static final String SCALE

See Also:

• Constant Field Values

TRANSLATE

public static final String TRANSLATE

See Also:

• Constant Field Values

WARP

public static final String WARP

See Also:

• Constant Field Values

ROI

public static final String ROI

See Also:

• Constant Field Values

Constructor Details

BaseScaleOperationJAI

public BaseScaleOperationJAI(String operation)
                      throws OperationNotFoundException

Constructor for BaseScaleOperationJAI.

Parameters:

operation - name of the JAI operation we wrap.

Throws:

OperationNotFoundException

BaseScaleOperationJAI

public BaseScaleOperationJAI(OperationDescriptor operation)

Constructor for BaseScaleOperationJAI.

Parameters:

operation - OperationDescriptor of the JAI operation we wrap.

BaseScaleOperationJAI

public BaseScaleOperationJAI(OperationDescriptor operation,
 ParameterDescriptorGroup descriptor)

Constructor for BaseScaleOperationJAI.

Parameters:

operation - OperationDescriptor of the JAI operation we wrap.

Method Details

deriveGridCoverage

protected GridCoverage2D deriveGridCoverage(GridCoverage2D[] sources,
 OperationJAI.Parameters parameters)

Description copied from class: OperationJAI

Applies a JAI operation to a grid coverage. This method is invoked automatically by OperationJAI.doOperation(org.geotools.api.parameter.ParameterValueGroup, org.geotools.util.factory.Hints). The default implementation performs the following steps:

• Gets the sample dimensions for the target images by invoking the deriveSampleDimension(...) method.
• Applied the JAI operation using OperationJAI.createRenderedImage(javax.media.jai.ParameterBlockJAI, java.awt.RenderingHints).
• Wraps the result in a GridCoverage2D object.

Overrides:

deriveGridCoverage in class OperationJAI

Parameters:

sources - The source coverages.

parameters - Parameters, rendering hints and coordinate reference system to use.

Returns:

The result as a grid coverage.

See Also:

• OperationJAI.doOperation(org.geotools.api.parameter.ParameterValueGroup, org.geotools.util.factory.Hints)
• OperationJAI.deriveSampleDimension(org.geotools.coverage.GridSampleDimension[][], org.geotools.coverage.processing.OperationJAI.Parameters)
• JAI.createNS(java.lang.String, java.awt.image.renderable.ParameterBlock, java.awt.RenderingHints)